Failed Pod Rescheduling Due to Node Affinity Misconfiguration

Pods failed to reschedule after a node failure due to improper node affinity rules.

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What Happened

When a node was taken down for maintenance, the pod failed to reschedule due to restrictive node affinity settings.

Diagnosis Steps

1Checked pod events and noticed affinity rule errors preventing the pod from scheduling on other nodes.
2Analyzed the node affinity configuration in the pod spec.

Root Cause

Node affinity rules were set too restrictively, preventing the pod from being scheduled on other nodes.

Fix/Workaround

• Adjusted the node affinity rules to be less restrictive.
• Re-scheduled the pods to available nodes.

Lessons Learned

Affinity rules should be configured to provide sufficient flexibility for pod rescheduling.

How to Avoid

1Set node affinity rules based on availability and workloads.
2Regularly test affinity and anti-affinity rules during node maintenance windows.